/*
 * Copyright 2013, Edmodo, Inc. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this work except in compliance with the License.
 * You may obtain a copy of the License in the LICENSE file, or at:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" 
 * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language 
 * governing permissions and limitations under the License. 
 */

package com.smartandroid.sa.cropper;

import android.graphics.Rect;

/**
 * Handle helper class to handle horizontal handles (i.e. top and bottom
 * handles).
 */
class HorizontalHandleHelper extends HandleHelper {

	// Member Variables ////////////////////////////////////////////////////////

	private Edge mEdge;

	// Constructor /////////////////////////////////////////////////////////////

	HorizontalHandleHelper(Edge edge) {
		super(edge, null);
		mEdge = edge;
	}

	// HandleHelper Methods ////////////////////////////////////////////////////

	@Override
	void updateCropWindow(float x, float y, float targetAspectRatio,
			Rect imageRect, float snapRadius) {

		// Adjust this Edge accordingly.
		mEdge.adjustCoordinate(x, y, imageRect, snapRadius, targetAspectRatio);

		float left = Edge.LEFT.getCoordinate();
		float top = Edge.TOP.getCoordinate();
		float right = Edge.RIGHT.getCoordinate();
		float bottom = Edge.BOTTOM.getCoordinate();

		// After this Edge is moved, our crop window is now out of proportion.
		final float targetWidth = AspectRatioUtil.calculateWidth(top, bottom,
				targetAspectRatio);
		final float currentWidth = right - left;

		// Adjust the crop window so that it maintains the given aspect ratio by
		// moving the adjacent edges symmetrically in or out.
		final float difference = targetWidth - currentWidth;
		final float halfDifference = difference / 2;
		left -= halfDifference;
		right += halfDifference;

		Edge.LEFT.setCoordinate(left);
		Edge.RIGHT.setCoordinate(right);

		// Check if we have gone out of bounds on the sides, and fix.
		if (Edge.LEFT.isOutsideMargin(imageRect, snapRadius)
				&& !mEdge.isNewRectangleOutOfBounds(Edge.LEFT, imageRect,
						targetAspectRatio)) {
			final float offset = Edge.LEFT.snapToRect(imageRect);
			Edge.RIGHT.offset(-offset);
			mEdge.adjustCoordinate(targetAspectRatio);

		}
		if (Edge.RIGHT.isOutsideMargin(imageRect, snapRadius)
				&& !mEdge.isNewRectangleOutOfBounds(Edge.RIGHT, imageRect,
						targetAspectRatio)) {
			final float offset = Edge.RIGHT.snapToRect(imageRect);
			Edge.LEFT.offset(-offset);
			mEdge.adjustCoordinate(targetAspectRatio);
		}
	}
}
